The stomach cavities of colonial polyps are interconnected, enabling food to be shared among all the polyps within the colony. If one polyp catches more than its fair share of food, it is shared with the colony.
Fish fry released during the day from outside the boundaries of a reef always swim away into open water. This is thought to be a survival behaviour, with heaps of hungry fish present on the reef. The way the fry determines the direction of the reef is unknown.
